Polymeric composition of matter, oriented polymeric films and shrink bags made therefrom

Claim 2

A polymeric composition of matter comprising a blend characterised by 10% to 90% linear low density polyethylene and 90% to 10% ethylene vinyl acetate, the percentages being by weight.

Claim 3

An oriented polymeric film characterised by comprising a blend according to claim 1.

Claim 4

An oriented film according to claim 2, wherein the blend composition comprises 20% to 30% by weight of linear low density polyethylene.

Claim 5

An oriented multiple layer polymeric film, comprising a first, barrier layer having second and third layers adhered one to each of the opposite surfaces of the first layer, characterised in that the second layer is 10% to 90% linear low density polyethylene and 90% to 10% ethylene vinyl acetate, and the third layer is selected from ethylene vinyl acetate, and blends of 10% to 90% linear low density polyethylene with 90% to 10% ethylene vinyl acetate, the percentages quoted being by weight.

Claim 6

An oriented multiple layer polymeric film, comprising a first, barrier layer having second and third layers adhered one to each of the opposite surfaces of the first layer, characterised in that the second layer is 10% to 90% linear low density polyethylene and 90% to 10% ethylene vinyl acetate, and the third layer is selected from ethylene vinyl acetate, and blends of 10% to 90% linear low density polyethylene with 90% to 10% ethylene vinyl acetate, the percentages quoted being by weight.

Claim 7

An oriented film according to claim 4, characterised in that the second and third layers are 20% to 40% by weight linear low density polyethylene and 60% to 80% by weight ethylene vinyl acetate, the ethylene vinyl acetate having a vinyl acetate content of 6 to 12 mole percent and a melt index of 0.3 to 0.9, and the linear low density polyethylene having a melt index of 0.5 to 1.5.

Claim 8

An oriented multiple layer polymeric film, comprising a first, barrier layer having second and third layers each adhered to a respective one of the opposite surfaces of the first layer, characterised in that the second and third layers both have essentially the same composition, a fourth layer is adhered to one of the'second and third layers and a fifth layer is adhered to the fourth layer, and further characterised in that the second, third and fifth layers comprise ethylene vinyl acetate, while the fourth layer comprises 10% to 100% by weight linear low density polyethylene.

Claim 9

An oriented multiple layer polymeric film, comprising a first, barrier layer having second and third layers each adhered to a respective one of the opposite surfaces of the first layer, characterised in that the second and third layers both have essentially the same composition, a fourth layer is adhered to one of the'second and third layers and a fifth layer is adhered to the fourth layer, and further characterised in that the second, third and fifth layers comprise ethylene vinyl acetate, while the fourth layer comprises 10% to 100% by weight linear low density polyethylene.

Claim 10

An oriented multiple layer polymeric film comprising a first, barrier layer having second and third layers each adhered to a respective one of the opposite surfaces of the first layer, with fourth and fifth layers adhered to the second and third layers on the respective surfaces of the latter layers opposite the first layer, characterised in that the second and third layers have essentially the same composition and comprise a first pair of layers; the fourth and fifth layers have essentially the same composition and comprise a second pair of layers, and further characterised in that in the combined composition of the first and second pairs of layers, at least one of the pairs comprises at least 50% by weight of an ethylene vinyl acetate component, the remainder of that pair being a linear low density polyethylene; and at least one of the said pairs comprises at least 10% by weight of a linear low density polyethylene component, the remainder of that pair being ethylene vinyl acetate, the requirement for the presence of at least 50% of the ethylene vinyl acetate component and for. at least 10% of the linear low density polyethylene component being met either by one of the said pairs having both the components or by each of the said pairs having a respective one of the components.

Claim 11

An oriented multiple layer polymeric film comprising a first, barrier layer having second and third layers each adhered to a respective one of the opposite surfaces of the first layer, with fourth and fifth layers adhered to the second and third layers on the respective surfaces of the latter layers opposite the first layer, characterised in that the second and third layers have essentially the same composition and comprise a first pair of layers; the fourth and fifth layers have essentially the same composition and comprise a second pair of layers, and further characterised in that in the combined composition of the first and second pairs of layers, at least one of the pairs comprises at least 50% by weight of an ethylene vinyl acetate component, the remainder of that pair being a linear low density polyethylene; and at least one of the said pairs comprises at least 10% by weight of a linear low density polyethylene component, the remainder of that pair being ethylene vinyl acetate, the requirement for the presence of at least 50% of the ethylene vinyl acetate component and for. at least 10% of the linear low density polyethylene component being met either by one of the said pairs having both the components or by each of the said pairs having a respective one of the components.

Claim 12

An oriented film according to claim 7, characterised in that the said first pair of layers comprises 70% to 100% by weight of ethylene vinyl acetate and the second pair of layers comprises 10% to 90% by weight of linear low density polyethylene.

Claim 13

An oriented film according to claim 8, characterised in that the first pair of layers comprises 100% ethylene vinyl acetate and the second pair of layers comprises at least 50% linear low density polyethylene by weight.

Claim 14

An oriented film according to claim 7, characterised in that the first pair of layers comprises 50% to 100% by weight of linear low density polyethylene and the second pair of layers comprises 50% to 100% by weight of ethylene vinyl acetate.

Claim 15

An oriented film according to claim 10, characterised in that the first pair of layers comprises at least 90% by weight of linear low density polyethylene and the second pair of layers comprises at least 90% by weight of ethylene vinyl acetate.

Claim 16

An oriented film according to claim 6, characterised in that the fourth layer is 100% linear low density polyethylene.

Claim 17

An oriented film according to any of claims 4 to 12, characterised in that the said barrier layer is selected from polyvinyl chloride-polyvinylidene chloride copolymer, ethylene vinyl alcohol copolymer and polymeric blends containing ethylene vinyl alcohol copolymer.

Claim 18

An oriented film according to any of claims 4 to 13, characterised in that the overall composition of the film comprises 20% to 30% linear low density polyethylene.

Claim 19

A shrink bag made from an oriented film according to any of claims 2 to 14.

Claim 20

A shrink bag according to claim 15 which comprises an extruded tubular article having one end closed by a heat seal and the other end open for filling the bag, said other end being closeable after filling by heat sealing.